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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03408294014dafbf496af161187682964f89bb809655465be0efa6fed80dc31e' 
  AND token = 'hUtcfswWPybbIQ07Pe8onGt+XBAEez+HD18FL0K9hcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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