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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408d29bf56316f30f8af24c7938a60dc64ea2bcb2e1470aa8efc1d2fd0054665' 
  AND token = 'a+T1zqvZDxppnlsUAnmT0tFpMnv6ljlnn9NJC9K68cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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