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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f8dc7c1e3ad6d895cc5d9d386403fc7e6ad4e3929b950ee9cc0c56a2ca99bc' 
  AND token = 'Rjr9V+ECuPFYgYoTDbEIhyDLmKwa4lJuN4Bb39dCkDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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