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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fa5e72b3cc13ae9df6c2c08e1bf78df504b05ae7193d1d62d940a4e52631f1' 
  AND token = 'QIokpbuk1MmyU3v1c3JmaoBjQKhK4Hk5eKO6Ao2L6/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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