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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3ac65eeb1579731ca7ebc542b72fa213b0b5e6a3c59274c333dadc41878619' 
  AND token = 'jY/lt1ob/TOb83Xs+AyJ6HWoUZ6bdw3r3QGJDgdeXH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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