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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d6bff51546d247e3deece10f2f4ded7e5f1e04b6ca7fbe58c45e53683078f6' 
  AND token = '69aJ3Trz/ZR3JcmjFUV4GV/Qj3Jms3veCnfjxH7yXLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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