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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bece2ff4d07e961349752d7b33793251803f5da7538253631b8325bf027278cd' 
  AND token = 'UqOq+qvkLr7Q0S1MZ5ZmJqOJtdb59Pr+hDTRuZ+ZSzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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