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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82415900c9e4b6d1f0f1278fbf66f42ec4b7e75986ee0f8098882f8a086c092' 
  AND token = 'w2B1HHLGPKa94cVPM/9sLNgqPhv09y1afleRYxz8i1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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