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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8feed57682b161a68dbb076c0f57dc368d02a3617264c7e81a74d1beee597b90' 
  AND token = 'AGf4Zoc3sNOR+Kl3JknCM3Ba5ZqzvPu2sq7kG13CbU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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