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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b778798d5b5b67e4c2bd3226e9e2740b44cde8aaee37f9f69a2c44b8eddec1e' 
  AND token = 'CS69FAARSWspf8qlpgefwlQnyQ7DNon6v2nZ77yvyGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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