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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2961fcf5ebae382641974218cc52de85e9d3c9457695427626a3b20d803053' 
  AND token = '70e3XkgCgRmtTgzYpMmh2oq0tuIN7gsu2BC2e8EYxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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