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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06b1700c3ebbcd7a0dc3f8ca2ec9a83d19be6933728c24db07b084383fa27d9' 
  AND token = 'vhBlsSj3lRBbVLgvTZkoJjrM2jiLxu6Oxl9VcU9NXto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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