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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac6ad1546206a237f45b1f660d6ced2c6f2d7ae6e02a3b77aa93b108e9c2dd5' 
  AND token = 'PaRtlQRPxOmUOeW7Uc/RnWmiVJo35IjEURiRu9no10Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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