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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529a5e4d764339e869160af1b34a530bb2585225586c1163b75fcb6e63c33f92' 
  AND token = 'QtZUsRTKA1A03RfSILlaWaj5NFEiXaZ8F2BCIV52ITQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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