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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477f61014d3f4135443eb48dcd2222bdd79e0c0e28ac7e67fda9ed6313fda806' 
  AND token = 'GoVh+ye45bW2c9AzwT70U2xB6Y0p/n8t27dw47iMlbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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