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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8432c64b3ec1a0b61326723745789d66eeb4f2707b7b7b8c5f5d98a9259e1965' 
  AND token = 'r2dVzdSonaT4CfrDZjH338QJSzxCuFu4BtXjKvd0G90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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