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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a2cc401f926382404a2ae1d0261a4c60978619583619af00472275f213e155' 
  AND token = 'p9HbFt6tys+amxOKj6ZfetH4Kz/y6ZPa6HmnpdhZOuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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