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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b34fa03f75fa433e964d999ce7d50165a729202ce0f40b374ad507b88501fc2' 
  AND token = 'pcv5bI3gH+huVUuIctJ7eb+Vswe5kgEx33pl6FPEWQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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