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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e591e5ffe7e53d5756e2b8b1c7c513133a539838a0f07f5ac2e028feacecb547' 
  AND token = '2UfeNdlivUNGaYMeKO6klrSQuSCxDdXFJxdsTMXGNcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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