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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7386c38011283b2134fb658ce8b38958b8ce8d1cd94f1473a8e08bbf3823a17' 
  AND token = '7essv1X0G1TZQ4nKhAA09wC1+4q3h4QnK67qfnmpIX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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