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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9875ef4a3c02583fe4c19a62f5fa431c3fe3b761726f6ecdac0b231d689406bc' 
  AND token = 'FzOo0TQhp9jw0fbgxI8S6iauX2c3A98E9AU4u9FmU7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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