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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938616304ef8e34ad7c1b9c4f91c6cd498170ea78a5777d489cd376f5b6d4aea' 
  AND token = 'bxK/sajwRO3rAlaNGpB3rQ7Ofn2InYqbRGFinkg9c9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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