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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306818de167196d1e54839340f66e14b38f5f4c2a155be6d586d5c7a88038c35' 
  AND token = 'bu0XTbuMJ18e3OECF4vDTK7z0onf3/j5ga16JD+UZ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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