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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe496049f07945c807e9df25ebcd341c0f5c9eddfc72aaf30e65bd635f08ba' 
  AND token = 'N2eOWfee8C1M3G31SwXGxbJd9AIoO6FiU+LQUpNFxBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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