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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fef15b33be82d36b596a0f3d9af4576d45d6ce4ebbe984cbc268c0a9b22abf7' 
  AND token = 'YdDK3khDT4oXKKeupeFnEvnfmJp8nFGobPi7NTcGvZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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