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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136a5723e0da3279efb94cd29d129a1822fcae978e1a60799e02dd54e44eebd0' 
  AND token = 'oKN1VWbgAYWYWC/FtFwqwWUTroo1cbzncx+6zpQnXZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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