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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e917627877a0e6214bad2af9969e34d19eacafcab7f482ca7df10fc27cb7aceb' 
  AND token = 'NqIFbEMaRZneABFVb3iFa+uL/AO04DcjHkLn1+p/jWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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