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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905eb1e0602a11a47e088e31a9bef8afc0c9c8ca630ba13276ffa6edbe2fd314' 
  AND token = 'lKjjUEuR1h8/pny4OqVB73QIBHDhkn4XLt1428xyc0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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