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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7455b98988fee1b37a898d08a184d08bf54b602d29f2e6df3f742be35b93cb53' 
  AND token = 'x9ROkpwU8jSHM3EoVlZK0Ph7wQsfkLO4EUcd+W+tL7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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