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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376b4dcbb664e2b7d5dc096f39756a5aa0872f3cb260725049a25cf8ed1ad48a' 
  AND token = 'gjVzPXE/c6HhDgaajAr81gK1hpYEnuEAf/M9TDVob1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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