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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d259a94a4f16281844fd9426b5827dab58614cffbd2f2db9ff6941c267e040' 
  AND token = '/5I6Q/nIjH6Bu1gXA1AVN7V7O5XWj5gH1naUbLoxrJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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