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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f268a68d83145e1bc29c3664c3dcfd1338cf43409f41e2e5c6ee3cfbb4cc9fcf' 
  AND token = 'trLXiPGIskEfoSwYmR9jPkORSEv88P2H2gVUnB7gew8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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