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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124242882e191012f5f6505204ab887d0a8f63b72eb5d9266256ec2976b7d9ec' 
  AND token = '19Lxg2s89DFEvxlewGXEB99N8kp+vjdXiQLf7Y+DLrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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