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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f829dbfbecbdd5b2e42105da2054961a9fba020ccc7680eeb940128a8b01d0d' 
  AND token = '/igbWQHoQKZNi65jVz2LJwFR68Re543D3Ex7v25Rzqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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