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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d1b97cd2768f4dd632dadbe8cabeb9f6ba57fcab84c6e17a5a8d9c3315a126' 
  AND token = '6gMltPan++4m7IHlz5QNnES0q+gIHuiBll6fXBNSGxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00239

JSON explain

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