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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e00a018d4f70fdc29be09d1dcd406803dc2709e0077beef7ce8df9beea859c' 
  AND token = 'MTxel+NcEj/mxwiAl2Jc82kqL6heq1wCgEQ9hPu29oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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