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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2fd32c05bb67531a3dcbd1eb31c79d4faf9535075c4acdee82a78b3ef6f540' 
  AND token = 'D3oSq9we3Otwg8au/wfRqxg/lM29/YQYyNsbkEUfBpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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