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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd939639f00ad367c5e5c26a1886f5f825c4b7b27756b450cab9ef4da73bfa1f' 
  AND token = 'ApvaS8Qtc7SjLxl5XXWKG8LB3zJcGGR/Si5iw35IyfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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