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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4ba68f4737d9d17dd7deb6aa8c5703d60e09e73a436287950858224412631c' 
  AND token = 'k3sFH4ihlvxPU0kAn4og366ZYrrmw0D7wef9ySAY8Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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