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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2712252339462bc8cbd6ed8a64ecbcaebaa881a42aede19d836aa25fe28a4ca' 
  AND token = 'cbW5jxG1LtUZZR4j3ALgn2Lw7ywNF6AdU+r9ViwqE60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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