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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392217fe3d06abef2e9565b2a067fe87a6c5e52f0c7ebbc79ab179cc8e81dcf7' 
  AND token = 'aX+BTceWPFsgdJYK03jHFqkEctULyardA5L7smKH6h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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