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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61de9faa33990b209dc0fde473c291bde00dcbe6a346412e772d4977e0e4f2f2' 
  AND token = '+pTTvLz9R2lLOhIYFG+q0Zp958Uugrso3BL50fzhY8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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