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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fb68f6ccdc57ac0213b28993435fd23c4d9bac4e67b7e53be4acd74c01284e' 
  AND token = 'pSD8sNzyRjN/gM/ne13nEL+KEJ2G0FsNFDgKlQj2F5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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