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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84b0b39176b5203113113245ca11dd98de303efd7007e7d65283f43764f9ac6' 
  AND token = '1eAC+6uDPqiQo8nDwL7zW3ZhSbbdOIHTsnyZFl880YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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