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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e9891d37af93a92b821d76129795422ed10205815e7014c4167e464dced66d' 
  AND token = 'knKyoMVxS+nXIz5EyBJipMFMkYv2ZynuRu1PQ1ODXLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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