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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f449162e60ac0403d6a2feb42f11fa70cf52fc988431222c1ae1ef3a7ab5c906' 
  AND token = 'U+3qI9r90PSiezUkXwYzeAFx0yzXg6Xybe0Z8DLahME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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