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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade78c787fc073a1c4bff9455ea0a09ae8a353af3eec1022de27d9c65444be49' 
  AND token = 'K/4YLAwG919kGAdApciR8NqYJ676iUfNtbLi/2kxNPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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