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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6073e4222ff45bb7c496591336a66671530c094650b8ea6857df300243c2d3fe' 
  AND token = 'a0JjyJju+hb8fSthstEH6jp46KUl+NAt6vrhkHhxF04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}