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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f8772515875df6383ff319976117cb8fa2569a586fec1588be2dab4c4f6b6c' 
  AND token = 'g3+TjM68yU/NCuuOV3yBqS6n8G71rIZx5Ifzg2aj3tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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