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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9043e7e61c07e9ec6d0f4291b7f76d70e8e37c4ca2dca1ee276bb8ded074f137' 
  AND token = 'bwoets7bvQV4wm+uKx2/OhGnyC8Qm6uTP/JNburiNH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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