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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ea6dfa3429b5f73af8c312ecd2f624cb624815519cd91150811d5bdbc9347e' 
  AND token = 'cOhTtI2qREg8qHOk9ES9pq2nXS4VLcf9zOitHyhsXvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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