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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0734ab1d5dd2faba270f584efd566b40569b7c2ee6feb46f4d2e076b390709e5' 
  AND token = 'PFitQNS4Pm0UmOM53yMyucMOdKpQDhBRI+R3QxfPfoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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