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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2476b81b303dd5a6f4c2cc19d968092a8f3a9dc7efad2b637e22d957ea73216' 
  AND token = 'Xf4ybSIgrTj4ibCSuhZ7uGjmNM0SArxkwriIFaWJvm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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