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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87d55fd5b1e6268db0eb0cfba98f4481db6ce74ae51cc8aa0285fdbba64622e' 
  AND token = 'Mwu1wTvDMnzU9RtzX1X9uCagqGfmXffYELuAF6jvRE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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