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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fa7b9a4a5834110d9a69f57f7530aa4d5e69462623ee55a9306364caec407d' 
  AND token = 'lPeVKgZY9JqZXOKsK7dLF1GX6FbdIyPjqp5TZAbgaO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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