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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3079aaffecb6927d68b48608870e989b39ea9ed82b1b96d20f4ef8248637896' 
  AND token = 'wnAbxCcvD5tHO7QII2U7Kvyv1wV9meGQG4au35MZtFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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