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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c57b61e56d743286827c201dfac8af65d9ca38360ddf69b4ba27fd3b17d4f3' 
  AND token = 'Jbpm/S3r4DI2fY5SHeNzRCIZBoPQVldxz3bP5l2m4Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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