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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a89415fc34d000218fa6cb208f699d51f371de580aa3d62ee49c73a956f481b' 
  AND token = 'swyhFzu7lgXGL1FqEVa93pkFT+feopuaTvu2xF5msiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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